CTA Tools 2039 12-Point Triple Square Tamper-Proof Wrench, 16mm 16-Millimeter Triple Square Design Designed to Service Fasteners on VW, Audi, Porsche and Some Detroit Diesel Engines Features a 2-Piece Design for High Torque Applications Wrench is Precision Machined for an Exact Fit Wrenches Utilize 1/2-Inch Square Drive and Measure 2.5-Inch in Length